This chain of transmission is sound according to the standards of both al-Bukhārī and Muslim.

Aḥmad ⦗6/433⦘ and al-Ṭaḥāwī ⦗1/82–83⦘ also brought it through several routes from Shuʿbah with the wording: “Bilāl or Ibn Umm Maktūm,” expressing uncertainty on both occasions.

It is likewise a version of Shuʿbah narrated from ʿAbd Allāh ibn Dīnār, from Ibn ʿUmar; al-Ṭaḥāwī recorded it.

Al-Nasāʾī ⦗2/105⦘, al-Ṭaḥāwī once again, Aḥmad, and al-Ṭabarānī later transmitted it through Hishīm, from Manṣūr ibn Zādān, from Khabīb, this time with complete certainty about the second muezzin, in the wording:
“When Ibn Umm Maktūm gives the call, eat and drink; but when Bilāl gives the call, neither eat nor drink.”
Aḥmad’s wording continues: “Sometimes a woman would still be finishing her pre-dawn meal and would say to Bilāl, ‘Wait until I have completed my suḥūr.’”

This chain is also authentic, just like the first.

Ibn Khuzaymah, Ibn al-Munḏhir, and Ibn Ḥibbān likewise narrated it through other routes from Shuʿbah.

Al-Ḥāfiẓ Ibn Ḥajar said ⦗2/81⦘:
“Ibn ʿAbd al-Barr and a group of leading scholars claimed that the report is reversed (muqallab) and that the correct version is the one found in the main text. I used to lean toward that opinion until I found the ḥadīth in Ṣaḥīḥ Ibn Khuzaymah by two additional routes from ʿĀʾishah, and some of its wordings contain elements that make it unlikely that an error occurred, namely his statement:”